参数资料
型号: AD9522-1BCPZ-REEL7
厂商: Analog Devices Inc
文件页数: 25/84页
文件大小: 0K
描述: IC CLOCK GEN 2.5GHZ VCO 64LFCSP
标准包装: 750
类型: 时钟发生器,扇出配送
PLL:
输入: CMOS,LVDS,LVPECL
输出: CMOS,LVDS
电路数: 1
比率 - 输入:输出: 2:12,2:24
差分 - 输入:输出: 是/是
频率 - 最大: 2.65GHz
除法器/乘法器: 是/无
电源电压: 3.135 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 带卷 (TR)
AD9522-1
Rev. 0 | Page 31 of 84
Mode 2: High Frequency Clock Distribution—CLK or
External VCO > 1600 MHz
The AD9522 power-up default configuration has the PLL
powered off and the routing of the input set so that the CLK/
CLK input is connected to the distribution section through the
VCO divider (divide-by-1/divide-by-2/divide-by-3/divide-by-4/
divide-by-5/divide-by-6). This is a distribution-only mode that
allows for an external input up to 2400 MHz (see
). The
maximum frequency that can be applied to the channel dividers
is 1600 MHz; therefore, higher input frequencies must be divided
down before reaching the channel dividers.
When the PLL is enabled, this routing also allows the use of the
PLL with an external VCO or VCXO with a frequency <2400 MHz.
In this configuration, the internal VCO is not used and is powered
off. The external VCO/VCXO feeds directly into the prescaler.
The register settings shown in Table 26 are the default values of
these registers at power-up or after a reset operation.
Table 26. Default Register Settings for Clock Distribution Mode
Register
Description
0x010[1:0] = 01b
PLL asynchronous power-down (PLL off )
0x1E0[2:0] = 000b
Set VCO divider = 2
0x1E1[0] = 0b
Use the VCO divider
0x1E1[1] = 0b
CLK selected as the source
When using the internal PLL with an external VCO, the PLL
must be turned on.
Table 27. Settings When Using an External VCO
Register
Description
0x010[1:0] = 00b
PLL normal operation (PLL on)
0x010 to 0x01E
PLL settings; select and enable a
reference input; set R, N (P, A, B), PFD
polarity, and ICP according to the intended
loop configuration
0x1E1[1] = 0b
CLK selected as the source
An external VCO requires an external loop filter that must be
connected between CP and the tuning pin of the VCO. This
loop filter determines the loop bandwidth and stability of the
PLL. Make sure to select the proper PFD polarity for the VCO
being used.
Table 28. Setting the PFD Polarity
Register
Description
0x010[7] = 0b
PFD polarity positive (higher control
voltage produces higher frequency)
0x010[7] = 1b
PFD polarity negative (higher control
voltage produces lower frequency)
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